Jen may refer to:
- Jennie, a character in lonelygirl15.
- Jennifer, a character in lonelygirl15.
- Jennifer, a character in KateModern.
- Jenni Powell, a production assistant for lonelygirl15 and an active member of the community.
- Jennifer Roth, a director, editor, writer, and camera operator for lonelygirl15
- Jennifer Thompson, a fan who plays Jennifer in lonelygirl15